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Chiari Type I Malformation Diagnosis The test of choice used to diagnose Chiari I malformation is magnetic resonance imaging, or MRI. This test uses a large, high-power magnet instead of X-ray. The MRI will reveal any crowding of the space between the brain and spinal cord. When having an MRI exam, a patient lies on a flat imaging table that slides into an enclosed tube, or scanner. It is important to lie very still while in the scanner, as the imaging device is very sensitive to movement. There is a machine-like sound while the pictures are taken. The space inside the tube is quite snug, so be sure to tell your health care provider if you are claustrophobic or uncomfortable in small places. Because MRI uses a high-power magnet, this test may not be performed on anyone with a metal implant, such as those used in artificial limbs and joints, aneurysm clips, shrapnel or metal heart valves. If you are unsure whether you have metal in your body, please tell the MRI technician before the test begins.
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